Anesthesia, SpinalAnesthesia, ObstetricalAnesthesia, GeneralAnesthesiaSolubilityAnesthesia, EpiduralAnesthesia, LocalBupivacaineAnesthetics, LocalSpinal CordAnesthesia, InhalationAnesthesia, ConductionCesarean SectionAnesthesia, IntravenousAnesthesia Recovery PeriodAdjuvants, AnesthesiaEphedrineAdministration, InhalationLidocaineAnesthesia, DentalSpinal Cord InjuriesAnesthetics, InhalationHypotensionInhalation ExposureAnesthetics, IntravenousAnesthetics, CombinedTetracainePropofolInjections, SpinalNerve BlockAmbulatory Surgical ProceduresMonitoring, IntraoperativeMepivacaineFentanylSpecific GravityIsofluraneAnestheticsPrilocainePain, PostoperativeMethyl EthersSmoke Inhalation InjurySurgical Procedures, MinorAnesthesiologyNitrous OxideBurns, InhalationDouble-Blind MethodIntraoperative ComplicationsSensationPreanesthetic MedicationCarticaineHalothaneConscious SedationPostoperative Nausea and VomitingInhalationPost-Dural Puncture HeadacheProspective StudiesShiveringKetamineSpinal PunctureSufentanilAnesthesia, Closed-CircuitAnalgesics, OpioidIsotonic SolutionsPregnancyHernia, InguinalSpinal Nerve RootsTime FactorsAmidesPlasma SubstitutesPain MeasurementAnesthetics, GeneralFemoral NerveHemodynamicsHydroxyethyl Starch DerivativesThiopentalEnfluraneMidazolamAnesthesia, CaudalIntraoperative PeriodHeart RateHypnotics and SedativesConsciousnessPostoperative ComplicationsSpinal NervesPentobarbitalIntubation, IntratrachealBlood PressureNeedlesSpinal Cord DiseasesAnesthetics, DissociativeEtilefrineSubarachnoid SpaceMorphineXylazineDose-Response Relationship, DrugApgar ScoreAerosolsLabor PainLumbosacral RegionElectroencephalography